Question

why does all the water of earth not get evaporated during hot summer days?

Answer 1

The water on earth cannot get evaporated during hot summers because weather is not same everywhere on earth. It is a huge planet, the temperature varies from one place to another. If at one part of earth there is hot summers then other part of earth there may be chilling winters and at another part there may be heavily raining. Thus, amount of water evaporated is compensated back to the earth surface by different climatic conditions.